KV is just a measurement of RPM - NOT a measurement of power.
All the BRCA-legal 13.5 motors are very similar, some are tuned for torque, others tuned for RPM, some run a little hotter than others, some are little easier to install, etc etc, so choose based on personal preference, local availability and what you have seen running well.
Personally I run the Speed Passion V3 motors, mainly because they are easy to wire up, and I have never felt down on power. Just down on driving skill!
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